单项选择题

Mercury's velocity is (so much) greater than (the Earth's) that it completes more than four revolutions around the Sun in the time (that) takes the Earth to complete (one).

A．so much
B．the Earth''s
C．that
D．one
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单项选择题
I ____________with thanks the help of my colleagues in the preparation of this new column.
A．express
B．confess
C．verify
D．acknowledge
单项选择题
It is strictly ___________that access to confidential documents is denied to all but a few.
A．secured
B．forbidden
C．regulated
D．determined
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